NaviLog: Sailing Logbook

NaviLog — The Digital Logbook for Skippers NaviLog turns your phone into a complete sailing logbook: automatic GPS track recording, a physics-based anchor alarm, one-tap man-overboard marking and a barograph with storm warning — all working offline and without an account. Your logbook belongs to you: it lives on your device, and goes to the cloud only if you switch on backup yourself. AUTOMATIC GPS TRIP LOGGING • Start a trip and NaviLog records your route in the background — even with the screen locked, no internet needed • Distance in nautical miles or kilometers, duration, average and maximum speed • Smart GPS filtering removes outliers for clean, accurate tracks • Notes, weather and crew for every leg of your voyage • Engine hours counter per trip and per yacht BAROGRAPH & TRIP STATISTICS • Every log entry saves the pressure from your phone's built-in barometer — measured on board, not taken from a forecast • Barograph per trip: the pressure curve right below speed and temperature on one time axis, like a meteogram • Lowest and highest pressure, biggest fall and rise — a fall of 3 hPa in 3 hours is marked as a gale sign • The live barograph records during every trip and while the storm alarm is on, and keeps the last 7 days ANCHOR ALARM (ANCHOR WATCH) • Physics-based swing circle calculated from chain length, water depth, bow height and boat length — not just a plain radius • Supports tide, mooring type and even a second anchor • Pre-alarm, GPS-loss alarm and low-battery warning • Adjust anchor position and chain length while the watch stays armed • Wind and swing history recorded for every anchorage • iPhone: the anchor alarm is reliable while NaviLog stays open (Apple limit) MAN OVERBOARD (MOB) • One tap marks the position instantly and guides you back with live bearing and distance • Works with or without an active trip recording WEATHER & STORM ALARM • Marine weather and wind forecast for your current position (online) • Pressure-drop storm warning from your phone's barometer — works completely offline, far from any coverage SEA CHARTS & OFFLINE MAPS • OpenSeaMap seamark overlay: buoys, lights, fairways on the map • Download chart regions before you cast off and review your tracks offline (Pro) FOR SKIPPER & CREW • Crew, skipper and yacht profiles, official crew lists • Checklists with templates (departure, safety briefing, engine check …) • Sea-miles certificates for licence training and charter proof EXPORT, BACKUP & SYNC (PRO) • Complete logbook as PDF — now with a barograph page — and sea-miles certificate • Tracks as GPX for OpenCPN, chart plotters and other apps • CSV import/export of trips, crew, yachts and anchor history • Optional cloud backup: your trips on phone and tablet, restored on a new device MADE FOR NIGHT WATCHES • Night-watch mode in red-on-black to protect your night vision • Dark mode, fully localized in English and German PRIVACY FIRST • No account needed, no ads, no tracking of your behaviour • Your logbook stays on your device unless you turn on cloud backup • Optional online features (weather, place names, map tiles) contact their services only when you use them WHO IS NAVILOG FOR? Sailors, skippers, charter crews, motorboaters and liveaboards — for coastal cruising, blue-water passages, regattas, sailing school and logging licence miles. If you have ever looked for a free sailing logbook app with an anchor alarm and a barograph that work offline, this is it. NaviLog is free as a full logbook with GPS tracking, anchor alarm, MOB and barograph. A single one-time purchase unlocks Pro (PDF/GPX/CSV export, cloud backup, crew lists, templates, offline chart download) — no subscription, ever. Note: NaviLog is a logbook and an aid to good seamanship — it does not replace official navigation equipment, weather services or safe anchoring practice.